[3E01-04] Combustion Phenomenon, Concrete Damage

9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[3E02] Evaluation of flammable gasses generated by organic materials in nuclear primary containment vessel (Part 3)

*Yukiko Furuhashi¹, Kazuhiro Koike¹, Takahiro Hoshino¹, Ryohei Endo¹ (1. TEPCO HD)

Keywords:

Cable,Primary Containment Vessel,Flammable gas,Steam,Organic Material

To investigate the possibility of the flammable gasses contributed to the explosion accident of the Unit 3 reactor building in the Fukushima Daiichi Nuclear Power Station, organic materials which exist in the nuclear primary containment vessel (PCV) were heated and evaluated the generated gas quantitatively. As a result, organic components were volatilized and organic flammable gases were generated when heated up to 1,000 degrees Celsius. It was revealed that these gasses were more generated under steam than hydrogen or oxygen gasses, and the amount per unit weight was the highest in the polyimide insulation. Considering the amount of organic materials used in the Unit 3 PCV, it was found that the CV cable generated the most amount of flammable gasses.